When a ruler falls vertically, 5 different persons catch it with different reaction times. ( $g=9.8 \mathrm{~m} \mathrm{~s}^{-2}$ )
A. Person A has reaction time of 0.20 s .
B. Person $B$ has reaction time of 0.22 s .
C. Person C has reaction time of 0.18 s .
D. Person D has reaction time of 0.19 s .
E. Person E has reaction time of 0.21 s .
What is the correct order of the distance travelled by the ruler for each person?
B $>$ E $>$ A $>$ C $>$ D
C $>$ D $>$ A $>$ B $>$ E
B $>$ E $>$ A $>$ D $>$ C
C $>$ D $>$ A $>$ E $>$ B
A uniform metallic wire having resistance $4 \Omega$ is bent to form a square loop (ABCD) (see figure). A resistance of $2 \Omega$ is connected between points $B$ and $D$ and a battery of 2 V is connected across points $A$ and $C$ as shown in the figure. Now the value of current $(l)$ is :

2 A
8 A
4.5 A
4 A
A 100-turn closely wound circular coil of radius 5 cm has a magnetic field of $3.14 \times 10^{-3} \mathrm{~T}$ at its centre. The current flowing through the coil, and the magnitude of the magnetic moment of this coil are, respectively :
(Take $\mu_0=4 \pi \times 10^{-7} \mathrm{~T} \mathrm{~m} / \mathrm{A}$ )
$2 \mathrm{~A}, 10 \mathrm{~A} \mathrm{~m}^2$
$2.5 \mathrm{~A}, 20 \mathrm{~A} \mathrm{~m}^2$
$2 \mathrm{~A}, 4 \mathrm{~A} \mathrm{~m}^2$
$2.5 \mathrm{~A}, 2 \mathrm{~A} \mathrm{~m}^2$
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